Erro ao enviar e-mail no aplicativo iOS com unidade

Estou trabalhando em um projeto da escola e estou tentando registrar dados armazenados em um jogo que criei em unidade.

Meu problema é que desejo enviar por e-mail os dados do aplicativo. Tudo funciona bem, o email está sendo enviado com os dados etc. Mas quando eu construo o aplicativo em um dispositivo iOS, ele não está enviando o email.

Não tenho nenhum erro na unidade, mas recebo esse erro no Xcode ao criar o aplicativo.Veja o erro abaixo. Espero que alguém possa me ajudar.

Saudações,

Georgi Iliev

MissingMethodException: Method not found: 'Default constructor not found...ctor() of System.Net.Configuration.MailSettingsSectionGroup'.
  at Mono.Security.Authenticode.AuthenticodeBase.GetSecurityEntry () [0x00000] in <filename unknown>:0 
  at System.Activator.CreateInstance (System.Type type, System.Object[] args) [0x00000] in <filename unknown>:0 
  at System.Configuration.Configuration.GetSectionGroupInstance (System.Configuration.SectionGroupInfo group) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationSectionGroupCollection.get_Item (System.String name) [0x00000] in <filename unknown>:0 
  at System.Configuration.Configuration.GetSection (System.String path) [0x00000] in <filename unknown>:0 
  at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection (System.String configKey) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationManager.GetSection (System.String sectionName) [0x00000] in <filename unknown>:0 
  at System.Net.Mail.SmtpClient..ctor (System.String host, Int32 port) [0x00000] in <filename unknown>:0 
  at MonoGmail.Start () [0x00000] in <filename unknown>:0 

(Filename: currently not available on il2cpp Line: -1)

adicionou a solução @programmers e obteve um novo erro misto.

MissingMethodException: Method not found: 'Default constructor not found...ctor() of System.Net.Configuration.MailSettingsSectionGroup'.
  at StartMenu.CloseApp () [0x00000] in <filename unknown>:0 
  at System.Activator.CreateInstance (System.Type type, Boolean nonPublic) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigInfo.CreateInstance () [0x00000] in <filename unknown>:0 
  at System.Collections.Generic.Comparer`1[T].get_Default () [0x00000] in <filename unknown>:0 
  at System.Configuration.Configuration.GetSectionGroupInstance (System.Configuration.SectionGroupInfo group) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationSectionGroupCollection.get_Item (System.String name) [0x00000] in <filename unknown>:0 
  at System.Configuration.Configuration.GetSection (System.String path) [0x00000] in <filename unknown>:0 
  at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection (System.String configKey) [0x00000] in <filename unknown>:0 
  at System.MonoTODOAttribute..ctor () [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationManager.GetSection (System.String sectionName) [0x00000] in <filename unknown>:0 
  at System.Net.Mail.SmtpClient..ctor (System.String host, Int32 port) [0x00000] in <filename unknown>:0 
  at System.Net.Mail.SmtpClient..ctor (System.String host) [0x00000] in <filename unknown>:0 
  at Mono_Gmail.Start () [0x00000] in <filename unknown>:0 
  at System.Array.GetGenericValueImpl[T] (Int32 pos, .T& value) [0x00000] in <filename unknown>:0 
  at System.Array.GetGenericValueImpl[T] (Int32 pos, .T& value) [0x00000] in <filename unknown>:0 
  at System.Array.GetGenericValueImpl[T] (Int32 pos, .T& value) [0x00000] in <filename unknown>:0 
  at System.Array.GetGenericValueImpl[T] (Int32 pos, .T& value) [0x00000] in <filename unknown>:0 
System.Array:GetGenericValueImpl(Int32, T&)
System.Array:GetGenericValueImpl(Int32, T&)
System.Array:GetGenericValueImpl(Int32, T&)
System.Array:GetGenericValueImpl(Int32, T&)

(Filename: currently not available on il2cpp Line: -1)

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